Sulfur and Nitrogen Co-Doped Graphene for Metal-Free Catalytic Oxidation Reactions

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Xiaoguang DuanShaobin Wang

Abstract

Sulfur and nitrogen co-doped reduced graphene oxide (rGO) is synthesized by a facile method and demonstrated remarkably enhanced activities in metal-free activation of peroxymonosulfate (PMS) for catalytic oxidation of phenol. Based on first-order kinetic model, S-N co-doped rGO (SNG) presents an apparent reaction rate constant of 0.043 ± 0.002 min(-1) , which is 86.6, 22.8, 19.7, and 4.5-fold as high as that over graphene oxide (GO), rGO, S-doped rGO (S-rGO), and N-doped rGO (N-rGO), respectively. A variety of characterization techniques and density functional theory calculations are employed to investigate the synergistic effect of sulfur and nitrogen co-doping. Co-doping of rGO at an optimal sulfur loading can effectively break the inertness of carbon systems, activate the sp(2) -hybridized carbon lattice and facilitate the electron transfer from covalent graphene sheets for PMS activation. Moreover, both electron paramagnetic resonance (EPR) spectroscopy and classical quenching tests are employed to investigate the generation and evolution of reactive radicals on the SNG sample for phenol catalytic oxidation. This study presents a novel metal-free catalyst for green remediation of organic pollutants in water.

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Citations

Oct 26, 2016·Journal of Hazardous Materials·Penghui ShaoShaobin Wang
May 11, 2017·Chemical Communications : Chem Comm·Yung-Han ShihHsi-Ya Huang
Jun 2, 2017·Chemical Society Reviews·Sergio NavalonHermenegildo García
Mar 14, 2017·Journal of Colloid and Interface Science·Kun-Yi Andrew LinHongta Yang
Jul 1, 2017·ACS Applied Materials & Interfaces·Jing LiLiangti Qu
Sep 3, 2018·Environmental Science and Pollution Research International·Ya PangLi-Ping Wang
Jun 15, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Yannan XiaYuyuan Yao
Jan 12, 2020·Environmental Science and Pollution Research International·Ragam N PriyankaBeena Mathew
May 8, 2020·Environmental Science and Pollution Research International·Ying ChenWenchao Peng
Apr 12, 2019·Environmental Science and Pollution Research International·Junchao ZhuLiqing Li
May 26, 2017·Environmental Science and Pollution Research International·Wenjie MaPeng Miao
Oct 23, 2020·ChemSusChem·Janina KossmannNieves López-Salas
Jan 27, 2021·Environmental Science and Pollution Research International·Feiyue QianYaoliang Shen
Dec 22, 2020·Advanced Science·Zhihong TianMarkus Antonietti
Apr 30, 2021·Environmental Science & Technology·Zhonghao WanDaniel C W Tsang

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